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Makoto Kaneko
NARO Institute of Livestock and Grassland Science, Miyota Research Station
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Yoshito Yamamoto
NARO Institute of Livestock and Grassland Science, Present address; Japan Grassland Agriculture and Forage seed Association
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Kazuhisa Nonaka
NARO Institute of Livestock and Grassland Science
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Yukio Akiyama
NARO Hokkaido Agricultural Research Center